+1 to betting the turn. As played, pretty ugly, guess it depends on how aggro he is. Has he shown that he can be a thinking player and rep stuff like this as a bluff?

And if we really think he has the 6, how did he get to the river with it? T6? Again, pretty tough but I think I lean towards calling, because his range favors A's more than it does 6's, and we beat everything else if hes spewing.

Villian's river line is mega wack. Your line makes it look like you have hands like A4, A9, AJ-AK, KQ, **** like that, and of course flush draws that fit your 3betting range (Which I don't know).

Then again, I would have bet the turn with a flush draw here.

That's why it's so weird that he just jams the river for what comes to actually be just over pot (I think?). It would be really dumb for him to do this with a strong hand because you look so weak, but it looks like you have more than just air, so if he has air here he needs you to fold basically everything.

Idk it looks like something like KQdd from him here, i'd call. There's just no real place in his range for a 6, and if he had it, he wouldn't just shove. I don't really know the player though, and you said he is weakish so I could be wrong. I like giving people credit for making the correct play a lot when it isn't merited at all.